β-Amino esters with an unsubstituted amino group such as 1 or 19 can be cyclized by two equivalents of alkylaluminum compounds such as triisobutylaluminum in yields up to 61% to the corresponding β-lactams 2 or 20.
具有两个未取代
氨基的β-
氨基酯(例如1或19)可以被两当量的烷基铝化合物(例如
三异丁基铝)环化,其收率高达相应β-内酰胺2或20的61%。